RIES AL. (1996). FOCUS: THE FUTURE OF YOUR COMPANY DEPENDS UPON IT. HARPER COLLINS PUBLISHERS.
Chicago-referens (17:e uppl.)RIES AL. FOCUS: THE FUTURE OF YOUR COMPANY DEPENDS UPON IT. USA: HARPER COLLINS PUBLISHERS, 1996.
MLA-referens (9:e uppl.)RIES AL. FOCUS: THE FUTURE OF YOUR COMPANY DEPENDS UPON IT. HARPER COLLINS PUBLISHERS, 1996.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.